#编写Shell脚本，实现两个变量之间的加减乘除运算。
#!/bin/bash

echo "plead input the first number: "
read num1

echo "plead input the second number: "
read num2

add=$(($num1+$num2))
echo "the add result is $add "

sub=$(($num1-$num2))
echo "the sub result is $sub "

mul=$(($num1*$num2))
echo "the mul result is $mul "

div=$(($num1/$num2))
echo "the div result is $div "

